SHARP ER-A320 Service Manual

SERVICE MANUAL

ELECTRONIC
CASH REGISTER

MODEL ER-A320

SRV Key : LKGIM7113RCZZ
PRINTER: CR-812A

(For "U" version)

CONTENTS

CHAPTER 1. SPECIFICATIONS ....................................................................... 1

CHAPTER 2. OPTIONS.....................................................................................4

CHAPTER 3. SRV. RESET AND MASTER RESET.......................................... 5

CHAPTER 4. HARDWARE DESCRIPTION ...................................................... 5

CHAPTER 5. TEST FUNCTION ......................................................................10

CHAPTER 6. CIRCUIT DIAGRAM & PWB LAYOUT ......................................13

PARTS GUIDE

Parts marked with " " are im portan t fo r main tain ing t he safet y of t he set. Be sure t o replace these parts wit h specified
ones for maintaining the safety and performance of the set.

This document has been published to be used

SHARP CORPORATION

for after sales service only.
The contents are subject to change without notice.

CHAPTER 1 . SPECIFICATIONS

1. Appearance/Rating

1) Appearance

Journal paper

Printer cover

Receipt paper

Drawer lock

2) Rating

Power source 120V AC m 10%, 60 Hz
Power consumption Stand-by: 9W

Operating: 35W (Max.)
Operating temperature 32°F to 104°F (0°C to 40°C)
Operating humidity 10% to 90% (RH)
Physical dimensions

including the drawer

420 (W) x 423 (D) x 304 (H) mm

(16.5 (W) x 16.7 (D) x 12.0 (H) in.)
Weight 13.0 kg (28.7 lbs.)

2. Keyboard

1) Standard keyboard layout

PLU/SUB NS

5 10

Receipt

Journal

RCPT PRINT

RA

RM

PO

%

CAL

CL

C

@

FOR

RFND

VOID

0 00 •

987

654

321

4

3

X

-

2

+

1

Customer display (Pop-up type)

Operator display

Mode switch

Keyboard

Drawer

2) Key top name

Standard key top

KEY TOP DESCRIPTION

RECEIPT Receipt paper feed key

JOURNAL Journal paper feed key

0~9, 00 Numeric keys

. Decimal point key

@/FOR Multiplication key

CL/C Clear key

PRINT Validation print key

Dept.1/+ Department 1/

Dept.2/– Department 2/

Dept.3/

TAX1

AUTO

SHIFT

CONV

CH

MDSE

CHK

SBTL

9

#/TM/SBTL

8

7

CA/AT

=

6

u Department 3/

Dept.4/

v Department 4/

Dept.5~10 Department 5~10 keys

PLU/SUB PLU/Subdepartment key

RCPT Receipt print key

- Discount key

AUTO Automatic sequencing key

% Percent ke y

NS No-sale key

Plus key (Calc. mode)

Minus key (Calc. mode)

Multiplication key (Cal c. mode)

Division key (Calc. mode)

KEY TOP DESCRIPTION

RA/RM Received on account/

Recall memory key (Calc. mode)

PO/CAL Paid out/Calculation mode key

RFND Refund key

VOID Void key

CH Charge key

CHK Check key

CONV Conversion key

MDSE SBTL Merchandise subtotal key

#/TM/SBTL Non-add code/Time display/Subtotal key

CA/AT/= Cash/Amount tendered/

Equals key (Calc. mode)

TAX1 SHIFT TAX1 shift key

DISPLAY DEVICE LED
NUMBER OF LINE 1 line
NUMBER OF POSITIONS 10 positions
COLOR OF DISPLAY Green
CHARACTER SIZE 14.2mm (H) x 8.0mm (H)

2) Customer display (Pop-up type)

Optional key top

KEY TOP DESCRIPTION

Dept. 11~40 Department 11~40 keys

DEPT# Department number entry key

TAX2 SHIFT~TAX4

SHIFT

AUTO2 Automatic sequencing 2 key

CONV2~4 Conversion 2~4 keys

CA2 Cash total 2 key
CH2 Charge 2 key

Tax2~Tax4 shift keys

- 2 Discount 2 key

%2 Percent 2 key

3. Display

1) Operator display

PLU/SUB

DEPT REPEAT

RCPT
OFF

: This appears when a transaction is finalized.

: This appears when the cash register computes the subtotal.

: This appears when the change due amount is displayed.

DISPLAY DEVICE LED
NUMBER OF LINE 1 line
NUMBER OF POSITIONS 7 positions
COLOR OF DISPLAY Green
CHARACTER SIZE 14.2mm (H) x 8.0mm (H)

3) Lamps

DESCRIPTION

AMOUNT 1~8
MINUS SIGN 2~10 : Floating

ERROR 10
PGM MODE 10
CA/AT

CH
CHK

SUBTOTAL/
SHORT TENDER

CHANGE 10 : Lights up whenever the

DEPARTMENT 9~10 No zero-suppressed.
PLU 8~10 No zero-suppressed.
REPEAT 8 Endless count, starting from 2.
DECIMAL POINT 5~1 TAB (4~2)
RECEIPT OFF 9 —
VALIDATION 10 : Light up when the validation

CONVERSION or
CALC. MODE

10 : Lights up when a registration

is finalized by dep r essing
CA/AT, CH or CHK key

10

change due amount appears
in the display.

printing is compulsory.

10

: This appears when for the calculator mode.

4. Printer

1) Printer specifications

ITEMS
Model name
No. of station 2 (Receipt/Journal)
Printing

system
Printing

capacity

Character
size

Print pitch Column distance : 3.35mm for between 1st and 2nd

Print speed Approx. 2.5 lines/sec.
Paper feed

speed
Reliability MCBF 2.5 million lines
Validation

form sensor
Near end

sensor

Cutter Manual
Print wheel

layout

CR-812A

Print wheel select ive type

Receipt : Max. 10 chr.
Journal : Max. 10 chr.
Validation : Max. 20 chr./1 line
Figure : 1.7mm (W) x 3.2mm (H)
Symbol : 2.4mm (W) x 3.2mm (H)

column 3.0mm for after 3rd column

Row distance : 5.1mm

Approx. 17 lines/sec. at receipt issued.

No

Journal side: No
Receipt side: No

Parts code: 00BM731002300

10198765432
PL

Z

TX

.

.

.

.

GT

CA
CK

-

-

-

-

-

-

#

­CH

%

CG

@
Q

2) Roll paper

Parts code DPAPR1006CSZZ
Dimension 44.5

Paper quality Journal/Receipt

m 0.5 mm in width

Max. 80mm in diamet er

Fine quality paper

Paper thickness : 0.0 6 to 0.09 mm
Paper weight : 52.3 to 64g/m

Validation form

Normal paper only

Thickness : 0.08 to 0.19 mm
Size : 115mm or more, 210mm or

under (W) x 70mm or more (H)

2

3) Validation paper

Paper quality Normal paper and pressure sensitive paper only

Thickness : 0.07 to 0.14 mm
Size : 115 mm or more (W) x 70 mm or more (H)

Printing area

19.1

29.4 29.4

10Dig.

Wide over 115mm

10Dig.

16

4) Inkin g

Parts code NROLR6638RCZZ
Ink supply system Ink roller
Form Roller
Specification Material-rubber
Roller life Approx. 0.6 million lines
Print color Purple

16.6

0

RA
PO
VD
NS
TX
FS

X
EX
RF

TD

½

ST

TL

1
2
3
4
5
6

5) Logo stamp

Material Porous rubber
Size 30mm (W) x 20mm (H)
Color Purple
Parts code for ink UINK1001CCZZ

5. Drawer

0

0

0

0

0

0

0

1

1

1

1

1

1

2

2

2

2

2

2

3

3

3

3

3

3

4

4

4

4

4

4

5

5

5

5

5

5

6

6

6

6

6

6

7

7

7

7

7

7

8

8

8

8

8

8

9

9

9

9

9

9

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

1) Drawer b o x an d dr aw er

Model name SK423
Size 420(W) x 423(D) x 112(H) mm
Color Gray 368
Material Metal
Bell —
Release lever Standard equipment; Situated at the bottom
Drawer open sensor Standard equipm ent

2) Money ca se

3) Lock

Separation from the drawer Allowed
Separation of the coin compartments from the

money case
Bill separator —
Number of compartments 5B/5C

Bill compartments

Coin compartments

5B/5C

Disallowed

CHAPTER 2. OPTIONS

1. Sales options

Location of th e lock Front
Method of locking

and unlocking

Key No. SK1-1

Locking : lnsert the drawer lock key into th e

Unlocking : lnsert the drawer lock key into the

lock and turn it 90 degrees
counterclockwise.

lock and turn it 90 degrees
clockwise.

No. NAME MODEL DESCRIPTIONS

1 COIN CASE ER-55CC2 5B/5C (For "U" version)
2 KEY TOP KIT ER-11KT7 1 x 1 key top

ER-12KT7 1 x 2 key top
ER-22KT7 2 x 2 key top
ER-11DK7G 1 x 1 dummy key
ER-51DK7G 5 x 1 dummy key

2. Service options

No. NAME PARTS CODE PRICE RANK DESCRIPTIONS

1 SRV KEY
2 MODE KEYGRIP COVER
3 DRIP-PROOF KEYBOARD COVER

AK
AL OP key only
BE

3. Supplies

No. NAME PARTS CODE PRICE RANK DESCRIPTIONS

1 ROLL PAPER
2INK ROLLER
3 INK FOR STAMP

AR
AY
AK

CHAPTER 3. SRV RESET AND MASTER RESET

The SRV key is used for operating in the SRV mode.

1. SRV reset (Program Loop Reset)

Used to return the machine back to its operational state after a lockup
has occurred.

Procedure

· Method 1

1) Unplug the AC cord from the wall out let.

2) Set the mode switch to (SRV’) position.

3) Plug in the AC cord to the wall outlet.

4) Turn to (SRV) position from (SRV’) position.

· Method 2

1) Set the mode switch to PGM position.

2) Unplug the AC cord from the wall out let.

3) While holding down JOURNAL FEED key and RECEIPT FEED
key, plug in the AC cord from the wall outlet.

Note: 1. The ER-A320 printer will cycle and print the following on the

journal

2

CHAPTER 4. HARDWARE DESCRIPTION

2. Master reset (All memory clear)

Used to clear all memory contents and return machine back to initial
settings.
(Returns keyboard back to the de fault keyboard layout.)

Procedure

1) Unplug the AC cord from the wall out let.

2) Set the MODE switch to the (SRV’) position.

3) Plug in the AC cord to the wall outlet.

4) While holding down JOURNAL FEED key, turn from (SRV’) posi­tion to the (SRV) position.

Note: 1. The ER-A320 display will flash the "." decimal point at the

right most position and will bee p 3 times.

2. The ER-A320 printer will cycle and print the following on the
journal

1

1. Block diagram

TRANSFORMER

NI-MH BATTERY

KEYBOARD

8X9 72KEY

MODE

SWITCH

8SIGNAL

CHIP SELECTSIGNAL

VOLTAGE

REGULATOR

STROBE
SIGNAL

RETURN
SIGNAL

DC-DC

CONVERTER

µPD78045

ADDRESS
BUS

CPU

LATCH

SIGNAL

ADDRESS
BUS

ADDRESS

LATCH

S-RAM

256 kbit

DRIVE SIGNAL

DRIVE SIGNAL

TIMING SIGNAL

DRIVE SIGNAL

DRIVE SIGNAL

HAMMER COMMON SIGNAL

DATA BUS

PRINTER POWER SOURCE : +18V

DISPLAY POWER SOURCE : +5.5V

DRIVER DRAWER

DRIVER

DRIVE SIGNAL

DIGIT SIGNAL

BUZZER

MOTOR
DRIVER

STAMP, PAPER

FEED DRIVER

PRINT WHEEL

MG DRIVER

SEGMENT
DRIVER

DIGIT DRIVER

PRINTER

CR-812A

OP.

DISPLAY

7SEG LED

10DIG

POP-UP

DISPLAY

7SEG LED

7DIG

2. CPU (UPD78045F) pin configuration

PIN

No.

NAME
1 P94 DIG7 Di splay digit 7 O H
2 P93 DIG6 Dl splay digit 6 O H
3 P92 DIG5 Di splay digit 5 O H
4 P91 DIG4 Di splay digit 4 O H
5 P90 DIG3 Di splay digit 3 O H
6 P81 DIG2 Di splay digit 2 O H
7 P80 DIG1 Di splay digit 1 O H
8VDD VDD+5V
9 P27 AD7 RAM Address & Data bus 7

10 P26 AD6 RAM Address & Data bus 6

11 P25 AD5 RAM Address & Data bus 5

12 P24 AD4 RAM Address & Data bus 4

13 P23 AD3 RAM Address & Data bus 3

14 P22 AD2 RAM Address & Data bus 2

15 P21 AD1 RAM Address & Data bus 1

16 P20 AD0 RAM Address & Data bus 0

17 /RESET /RESET Reset signal I L
18 P74 NU NU O H
19 P73 NU NU O H
20 AVSS AVSS GND
21 P17 KR11 Key return signal 11 I H
22 P16 KR10 Key return signal 10 I H
23 P15 KR9 Key return signal 9 I H
24 P14 KR8 Key return signal 8 I H
25 P13 KR7 Key return signal 7 I H
26 P12 KR6 Key return signal 6 I H
27 P11 KR5 Key return signal 5 I H
28 P10 VB Battery voltage I
29 AVDD AVDD +5V
30 AVREF AVREF +5V (VCC)
31 XT1 P04 Sub clock: 32.768 kHz I
32 XT2 XT2 O
33 VSS VSS GND
34 X1 X1 Main clock: 4.19 MHz I
35 X2 X2 O
36 P37 MD Printer mo tor ON signal O H
37 P36 BUZ Buzzer ON signal O H/L
38 P35 RF Receipt paper feed signal O H
39 P34 JF Journal paper feed signal O H
40 P33 STAMP Stamp ON signal O H
41 P32 /ALE Address latch signal O
42 P31 /CE Chip select signal O L

SIGNAL

NAME

DESCRIPTION I/O

I/O H

Printer magnet 8

I/O H

Printer magnet 7

I/O H

Printer magnet 6

I/O H

Printer magnet 5

I/O H

Printer magnet 4

I/O H

Printer magnet 3

I/O H

Printer magnet 2

I/O H

Printer magnet 1

PIN

No.

NAME
43 P30 /WE Write signal O L
44 P03 RMS NU I
45 P02 JMS Drawer open sensor I
46 P01
47 P00 PE Power enable signal I H
48 IC IC VSS
49 P72 P72 NU O H
50 P71 MG10 Printer magnet 10 O H
51 P70 MG9 Printer magnet 9 O H
52 VDD VDD +5V
53 P127 R-COM Prin t er receipt common

54 P126 J-COM Printer journal common

55 P125 VDD Mode signal (VDD) I H
56 P124 DR1 Standard drawer drive signal O H
57 P123 KR4 Key return signal 4 I H
58 P122 KR3 Key return signal 3 I H
59 P121 KR2 Key return signal 2 I H
60 P120 KR1 Key return signal 1 I H
61 P117 A14 RAM Address 14 O
62 P116 A13 RAM Address 13 O
63 P115 A12 RAM Address 12 O
64 P114 A11 RAM Address 11 O
65 P113 A10 RAM Address 10 O
66 P112 A9 RAM Address 9 O
67 P111 A8 RAM Address 8 O
68 P110 DR2 Option drawer drive signal O H
69 P107 DP/ST8 Display segment signal DP

70 P106 G/ST7 Display segment signal G

71 VLOAD VLOAD GND
72 P105 F/ST6 Display segment signal F

73 P104 E/ST5 Display segment signal E

74 P103 D/ST4 Display segment signal D

75 P102 C/ST3 Display segment signal C

76 P101 B/ST2 Display segment signal B

77 P100 A/ST1 Display segment signal A

78 P97 DIG10 Display digit signal 10 O H
79 P96 DIG9 Display digit sign al 9 O H
80 P95 DIG8 Display digit sign al 8 O H

SIGNAL

NAME

DESCRIPTION I/O

a Printer timing signal I H

OH

signal

OH

signal

Key strobe signal 8

Key strobe signal 7

Key strobe signal 6

Key strobe signal 5

Key strobe signal 4

Key strobe signal 3

Key strobe signal 2

Key strobe signal 1

OH

OH

OH

OH

OH

OH

OH

OH

3. RAM control

/CE

/WE

A8~A14

(WRITE)
As shown in the attached time chart, address signals are output from

P20-P27, P111-P117, and the lower address is latched with P32. The
write enable signal (P30) is output. The write data to the RAM are
output from P20-P27. Then the chip enab le signal (P3 1) is output to
write the data .

IC2

CPU

/ALE

AD0~AD7

IC3

74HC373

A0~A7

AD0~AD7

IC14

S-RAM

/WE: Write signal

When the si gnal is low , writing i s perform ed. When t he sig-

nal is high, reading is performed.
/CE: Chip select signal
A8-A14: Address bus
AD0-7: Address/Data bus
A0-1: Address bus signal
/ALE: Address latch signal
Address signals A0-A7 are used commonly with the data bus. When

the address latch signal /ALE is input to IC3, the address/data bus
signal AD0-AD7 access the RAM as a dd ress signals A0-A7.

(READ)
As shown in the attached time chart, address signals are outputted

from P20-P27, P111-P117, and the lower address is latched with P32.
The modes at P20-P27 are changed to the input mode. The chip
enable signal (P31) is output for the RAM. Then the output data from
the RAM are read from P20-P27.

RAM control

(READ cycle)

P111~P117

P20~P27

Lower address

P32

latch signal

P30

RAM /WE

RAM /OE

Fixed to LOW

P31

RAM /CS

P20~P27

READ timing

P20~P27

Select

Hammer common

30ns or above

Upper address

Lower address RAM data output

15ns or above

Fixed to HIGH.

Input
Output

15ns or
above

70ns or above

70ns or above

5. Printer motor drive circuit

0ns or above

RAM control

(WRITE cycle)

P111~P117

P20~P27

Lower address

P32

latch signal

RAM /WE

P30

RAM /OE

P20~P27

P20~P27

P20~P27

Select

RAM Data IN

Hammer common

30ns or above

Fixed to LOW.

RAM /CS

READ timing

Upper address

Lower address Input data to RAM

15ns or above

Input

Output

15ns or
above

30ns or above

50ns or above

0ns or
above

60ns or
above

0ns or above

1) Printer motor drive and brake circuit

Q17

B1340

R81

C32
220P

2.7K
R78
470

R79

2.7K

R80

22K

CPU

VP : +18V

IC6B

KID65003P

MD

IC2

The printer motor is operated by switching operation of transistor Q17
with the motor drive signal MD from the CPU.

VM

Q18

M

B926

2) Print solenoid drive circuit

4) Timing signal circuit

VJ

D28

1N4002

R83

JM1
JM2
JM3
JM4
JM5
JM6
JM7
JM8
JM9

JM10

RM1
RM2
RM3
RM4
RM5
RM6
RM7
RM8
RM9

RM10
VR

D29

1N4002

R85

CPU

2.7K

R82

2.7K

R84

IC7B

IC7D

IC7F

IC8A

IC8C

IC8E

IC8G

IC9B

IC9D

IC9F

Q19

B926

Q20

B926

220/2W

220/2W

VP : +18V

IC6D

C40

KID65003P

100µF/16V

J-COM

IC2

R-COM

R136

R137

+

D30

C41

100µF/16V

+

IC7C

IC7E

IC7G

IC8B

IC8D

IC8F

IC9A

IC9C

IC9E

IC9G

KID65003P

RB441Q

IC6C

D31
RB441Q

1K

AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
MG9

MG10

AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
MG9

MG10

VP : +24V

1K

Since the address bus is used to drive the print solenoid, an access to
the RAM can not be pe rfor me d d uri ng pr int ing . The c omm on v olt age of
the print solenoid is supplied by switching operations of transistors
Q20 and Q19 with the J-COM signal and the R-COM signal.

3) Paper feed solenoid and stamp solenoid drive
circuit

VCC:+5V

C29

10U/16V

α

R133

IC2

CPU

C37

1000P

50V

1K

The timing si gnal a is delivered to the CPU by the photo transistor
attached to the printer.

5. Drawer drive circuit

DR1

JMS

R53

1K

VP : +18V

Q21

C3784

STANDARD DRAWER

R54
15K

L2

R55
15K

VM

CPU

RF

JF

IC2

STAMP

1

7A

7

6G

1

6F

RF: Paper feed solenoid drive signal (Receipt side)
JF: Paper feed solenoid drive signal (Journal side)
STAMP: Stamp solenoid drive signal (Receipt side)

CPU

IC2

DR2

R89

1K

VP : +18V

4.7K

R57

Q14

C3784

OPTION DRAWER

The solenoid is dr iven by switching operation of transistor Q21 with the
drive signal DR1 fr om the CPU.

When an option drawer is used, the parts enclosed with the dotted line
must be attached to the PWB.